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434hw4sol

# 434hw4sol - CSE 434 TTh 9:15 AM Homework#4 Sample Solution...

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1 CSE 434 – TTh 9:15 AM Homework #4 Sample Solution October 28, 2003 Please email Catherine ( ) if you have questions. (10 points for each question) 1. (4.9) A LAN uses Mok and Ward’s version of binary countdown. At a certain instant, the ten stations have the virtual station numbers 8, 2, 4, 5, 1, 7, 3, 6, 9, and 0. The next three stations to send are 4, 3, and 9, in that order. What are the new virtual station numbers after all three have finished their transmissions? 8 2 4 5 1 7 3 6 9 0 8 3 0 5 2 7 4 6 9 1 After station 4 sends 8 0 1 5 3 7 4 6 9 2 After station 3 sends 9 1 2 6 4 8 5 7 0 3 After station 9 sends 2. (4.14 ) Six stations, A through F, communicate using the MACA protocol. Is it possible that two transmissions take place simultaneously? Explain your answer. MACA protocol: sender to stimulate the receiver into outputting a short frame, so stations neaby can detect this transmission and avoid transmitting for the duration of the upcoming data frame. Yes.

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434hw4sol - CSE 434 TTh 9:15 AM Homework#4 Sample Solution...

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